P0736 Reverse Incorrect Ratio

P0736 indicates reverse incorrect ratio. The controller calculates a reverse gear speed relationship outside expected limits.

Code details

Generic OBD-II · P0

System: Transmission
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not authorize internal repair from P0736 alone; range data, pressure, fluid, and speed sensor signals must be checked.

Symptoms of P0736

Harsh, delayed, or slipping shifts, or being stuck in one gear.
Check-engine light, sometimes with limp-home mode.
Flaring RPM or a shudder under load.

Common causes of P0736

Low or degraded transmission fluid.
A failing speed sensor, shift solenoid, or pressure-control circuit.
Wiring, connector, or internal hydraulic/mechanical faults.

Useful checks before replacing parts

Compare commanded reverse, input speed, output speed, ratio data, pressure data, and engagement delay.
Check fluid level and condition, range sensor data, reverse solenoid commands, pressure-control response, and speed sensor plausibility.
Review whether reverse engagement is delayed, slipping, harsh, or unavailable.

Related OBD-II codes

These nearby transmission entries can help compare wording and pin down the fault area.